<clickhouse>
    <users>
        <john>
            <ssl_certificates>
                <common_name>client1</common_name>
            </ssl_certificates>
        </john>
        <lucy>
            <ssl_certificates>
                <common_name>client2</common_name>
                <common_name>client3</common_name>
            </ssl_certificates>
        </lucy>
        <peter>
            <no_password/>
        </peter>
        <jane>
            <password>qwe123</password>
        </jane>
    </users>
</clickhouse>
